Use single line comments, so that blocks can be commented out using /* .. */

h2/src/main/org/h2/server/web/WebSession.java

@@ -66,9 +66,8 @@ class WebSession {
 
     WebSession(WebServer server) {
         this.server = server;
-        /* This must be stored in the session rather than in the server.
-         * Otherwise, one client could allow saving history for others (insecure).
-         */
+        // This must be stored in the session rather than in the server.
+        // Otherwise, one client could allow saving history for others (insecure).
         this.commandHistory = server.getCommandHistoryList();
     }